@robs Wow. That’s quite a difference!
House-2 bed partial stone bungalow, 5kW Samsung Gen 6 ASHP (Self install)
6.9 kWp of PV
5kWh DC coupled battery
Blog: https://thegreeningofrosecottage.weebly.com/
Heatpump Stats: http://heatpumpmonitor.org/system/view?id=60
@robs Oops. Thanks for that. I've run it with a more accurate pipe sizing. Initially over 5m of pipe it looks like 0.054 bar for the corrugated and 0.013 bar for 28mm copper. So yes 4 times the pressure drop. I'll do a bit of measuring and see what Samsung have to say.
Measured pipe runs etc. The length of the Kaiflex pipe is 17.256m. Pressure drop at a flow rate of 15lpm is 0.066bar. Flow and return - so the pressure drop is 0.132 bar. If it was 28mm copper it would be 0.05bar. However estimating the length of the heating pipes (22mm and 15mm) the pressur drop is about 1.2 bar. At higher flow rates it gets a lot worse. Yes 28mm copper would be better however it's the rest of the heating circuit that's critical.
Delta T. Now it's between 4 and 5 at a flow temperature of 28 degrees C. The flow rate has dropped from 19 lpm to 15 lpm. How - I started trying to balance the rads. You get into a doom loop of adjust one and the others change. In the end I just set 9 of the 11 to '90 degrees on' from shut i.e. open the Lock Shield by a quater turn from shut. Most of the L/S are 'low authority' - half a turn and there are fully open. Will try again when it gets colder (and when I've got the hang of the IR camera).
Finally - anyone know what 'Eco Level4/5' is on the control panel?
@mike-h Got this reply from Samsung support:
The Eco level is there is an indication as to how the system is running at that given time, from Eco 1 where the immersion is operating only to Eco 5 where you have solar operating only. You should normally see this around the 3- 4 mark.
I have seen 2/5 - clear as mud.
HavenWise now have control of my system. Will report when I have more data (or any ...).
@raiph Looking forward to hearing what you experience. My heat pump should (hopefully, after a 2 year battle with my planning authority) be in within the next month or two and Havenwise was the direction I was thinking of going.
4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.
@jamespa Ok. Can someone settle an argument I've been having with myself. If I balance the radiators to get a better Delta T then the flow rate will decrease. Does this mean that the pump pressure will increase? Is a higher flow rate better as far as efficiency goes?
As for HavenWise - half way through me trying to balance the rads they change the Water Outlet temperature. Confused me. I've tried two methods - dual channel thermostats with K thermocouples and an infrared camera attachment on my phone. For the thermocouples - use a bit of tape to fix them to the front panel of the rads - top left/bottom right. Don't use the pipework. Switch off the lockshield valve and wait for it to cool down. When it is cold slowly open the L/S 15 degrees at a time until the flow face of the panel reaches the Water outlet temperature. Then check the return. Wait for 10 - 15mins and adjust until you get near to a Delta T of 5. As for the Infrared camera - it does match the thermocouple readings and also gives an indication of the heat flow across the rad. Be realistic Delta T or 4 to 6 should be OK.
Does anyone know the power consumption of a Samsung at various Water Outlet temperatures and flow rates. Saturday night 3 degrees outside and HavenWise set the WO temperaure to 27.5. 'Instantaneous power' was 900W. Bit high? The house didn't make it past 19 degrees.
I'll log the heating flow and return temperatures over a couple of days to try and get an idea what the HP is doing and also how HavenWise are controlling it.
Posted by: @raiph. If I balance the radiators to get a better Delta T then the flow rate will decrease. Does this mean that the pump pressure will increase? Is a higher flow rate better as far as efficiency goes?
I'm not sure what you mean by better. As a general principle you should be fully opening the valve on the radiator furthest away/last to heat up and then adjusting others down. You don't want to restrict the flow rate more than you need to to get equal delta t across all radiators (or if you are balancing for room temperature which is arguably better but more difficult, equal room temperature). However you do this at least one radiator valve should be fully open when balanced. If the resulting flow rate is too high then turn the pump down a notch or better still allow the Samsung itself to control it, which it can assuming this is a regular set up. It's not so much higher flow rate that is better, you need sufficient to carry the heat to the radiators and any more is wasteful. If you balance the rads with at least one valve fully open when balanced, that's the best you can do.
@toodles has, I believe, a balancing 'script', perhaps he cam post it again.
Probably best to balance before invoking havenwise. I don't know if you can disconnect them temporarily
4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.
@jamespa Here is the link to my guide:
https://renewableheatinghub.co.uk/how-to-balance-radiators-the-role-of-the-lockshield-valve
Regards, Toodles.
Toodles, he heats his home with cold draughts and cooks his food with magnets.
Are you all saying that the Delta T across the radiators is irrelevant?
- 22 Forums
- 2,011 Topics
- 43.9 K Posts
- 27 Online
- 3,184 Members
Join Us!
Trusted Installers
Struggling to find a reliable heat pump installer? A poor installation can lead to inefficiencies and high running costs. We now connect homeowners with top-rated installers who deliver quality work and excellent service.
✅ Verified, trusted & experienced installers
✅ Nationwide coverage expanding
✅ Special offers available
Latest Posts
-
RE: What happens when the outside temperature exceeds the upper WC point?
@ashp-bobba @old_scientist thanks both. Very useful.
By bontwoody , 6 hours ago
-
RE: Are Homeowners Being Silenced Over Faulty Heat Pumps?
@ectoplasmosis I’ve never had an issue naming and shami...
By Mars , 6 hours ago
-
RE: Would You Find Value in a Premium Installer-Supported Forum?
Thought I would be the 1st to give you a thumbs UP Mars...
By ASHP-BOBBA , 6 hours ago
-
-
RE: Grant Aerona fine tuning advice needed
@stopbar We have a 13kw R32 Grant and found running ...
By Uk_pete_2000 , 11 hours ago
-
RE: Grant Aerona3 - Home Assistant control via Modbus
This is true, but I about learning about agentic AI and...
By Grantmethestrength , 11 hours ago
-
RE: A question about battery life
Here's my take on this with some rough maths that might...
By Mars , 12 hours ago
-
RE: Is it KISS or constant – weather compensation vs. set flow temperature?
I had to laugh at this as I do exactly the same thing, ...
By Grantmethestrength , 12 hours ago
-
@eliuccio there are some very high level arguments in t...
By Judith , 13 hours ago
-
RE: Is my Samsung heat pump working too well?
@pooneil Apparently you can set up a different water la...
By bontwoody , 13 hours ago
-
RE: Solar Power Output – Let’s Compare Generation Figures
That's fine @irmartini and @editorbut let's keep this i...
By Transparent , 14 hours ago
-
RE: Battery sizing - How low can you go!
So just for completeness here is may last update on thi...
By bontwoody , 14 hours ago
-
RE: Mitsubishi Ecodan System Pressure Changes - An Issue or Expected ?
@alsocold123456 I would have thought it would last a bi...
By ASHP-BOBBA , 1 day ago
-
@editor Thank you for the information,do you have any i...
By Potatoman , 1 day ago
-
@cathoderay Years ago (40+) I enquired about moving our...
By Toodles , 1 day ago
-
RE: Share Your Experiences with Heat Pump Manufacturer Support
I didn't realise that Samsung even had customer support...
By JamesPa , 2 days ago
-
RE: New Heat Pump - mixer shower pressure
Just a little update, I eventually decided to put a pre...
By Spanners , 2 days ago
-
RE: Setback savings - fact or fiction?
I'm not a statistician, but I have had to use statistic...
By cathodeRay , 2 days ago
-
RE: Who's your electricity provider and what's your tariff?
@matthew_w It's a complex area and every case is diff...
By JamesPa , 3 days ago
Most Active This Week
# | Name | kWhs |
---|---|---|
1 | Mars | 412 |
2 | bontwoody | 175 |
3 | JamesPa | 169 |
4 | Pooneil | 158 |
5 | Majordennisbloodnok | 120 |
6 | Heatgeek | 111 |
7 | ASHP-BOBBA | 108 |
8 | Toodles | 108 |
9 | Transparent | 105 |
10 | cathodeRay | 94 |